Device HPET in DSDT patch returns error while compiling "object is not accessible from this scope (BUF0)"

Question

Does anyone know how to get rid of this compiling error? This is device in the dsdt, I am using a patch from a repository.

The original device HPET is:

Device (HPET)
                {
                    Name (_HID, EisaId ("PNP0103"))  // _HID: Hardware ID
                    Name (ATT3, ResourceTemplate ()
                    {
                        IRQNoFlags ()
                            {0}
                        IRQNoFlags ()
                            {8}
                        Memory32Fixed (ReadWrite,
                            0xFED00000,         // Address Base
                            0x00000400,         // Address Length
                            )
                    })
                    Name (ATT4, Buffer (0x02)
                    {
                         0x79, 0x00                                     
                    })
                    Method (_STA, 0, NotSerialized)  // _STA: Status
                    {
                        If (LEqual (OSFX, 0x03))
                        {
                            If (HPTF)
                            {
                                Return (0x0F)
                            }
                            Else
                            {
                                Return (0x00)
                            }
                        }
                        Else
                        {
                            Return (0x00)
                        }
                    }

The patched one, It's throwing that error. The problem is like this I am trying to boot OSX but I get a No hpet error.

Device (HPET)
                    {
                        Name (_HID, EisaId ("PNP0103"))  // _HID: Hardware ID
                        Name (ATT3, ResourceTemplate()
                        {
                            IRQNoFlags() { 0, 8, 11, 15 }



                            Memory32Fixed (ReadWrite,
                                0xFED00000,         // Address Base
                                0x00000400,         // Address Length
                                )
                        })
                        Name (ATT4, Buffer (0x02)
                        {
                             0x79, 0x00                                     
                        })




                        Name (_STA, 0x0F)
                        Method (_CRS, 0, NotSerialized)
                        {
                            Return (BUF0)
                        }
                    }